Discovery of a new TeV gamma-ray source: Ver J0521+211

S. Archambault; T. Arlen; T. Aune; B. Behera; M. Beilicke; W. Benbow; R. Bird; A. Bouvier; J. H. Buckley; V. Bugaev; K. Byrum; A. Cesarini; L. Ciupik; M. P. Connolly; W. Cui; M. Errando; A. Falcone; S. Federici; Q. Feng; J. P. Finley; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T. B. Humensky; P. Kaaret; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; S. Kumar; M. J. Lang; A. S. Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; J. Millis; P. Moriarty; R. Mukherjee; A. O'Faoláin De Bhróithe; R. A. Ong; A. N. Otte; N. Park; J. S. Perkins; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; K. Ragan; L. C. Reyes; P. T. Reynolds; G. T. Richards; E. Roache; D. B. Saxon; G. H. Sembroski; A. W. Smith; D. Staszak; I. Telezhinsky; M. Theiling; A. Varlotta; V. V. Vassiliev; S. Vincent; S. P. Wakely; T. C. Weekes; A. Weinstein; R. Welsing; D. A. Williams; B. Zitzer; M. Böttcher; S. J. Fegan; P. Fortin; J. P. Halpern; Y. Y. Kovalev; M. L. Lister; J. Liu; A. B. Pushkarev; P. S. Smith

doi:10.1088/0004-637X/776/2/69

Discovery of a new TeV gamma-ray source: Ver J0521+211

S. Archambault, T. Arlen, T. Aune, B. Behera, M. Beilicke, W. Benbow, R. Bird, A. Bouvier, J. H. Buckley, V. Bugaev, K. Byrum, A. Cesarini, L. Ciupik, M. P. Connolly, W. Cui, M. Errando, A. Falcone, S. Federici, Q. Feng, J. P. FinleyL. Fortson, A. Furniss, N. Galante, D. Gall, G. H. Gillanders, S. Griffin, J. Grube, G. Gyuk, D. Hanna, J. Holder, G. Hughes, T. B. Humensky, P. Kaaret, M. Kertzman, Y. Khassen, D. Kieda, H. Krawczynski, F. Krennrich, S. Kumar, M. J. Lang, A. S. Madhavan, G. Maier, P. Majumdar, S. McArthur, A. McCann, J. Millis, P. Moriarty, R. Mukherjee, A. O'Faoláin De Bhróithe, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, M. Pohl, A. Popkow, H. Prokoph, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, G. T. Richards, E. Roache, D. B. Saxon, G. H. Sembroski, A. W. Smith, D. Staszak, I. Telezhinsky, M. Theiling, A. Varlotta, V. V. Vassiliev, S. Vincent, S. P. Wakely, T. C. Weekes, A. Weinstein, R. Welsing, D. A. Williams, B. Zitzer, M. Böttcher, S. J. Fegan, P. Fortin, J. P. Halpern, Y. Y. Kovalev, M. L. Lister, J. Liu, A. B. Pushkarev, P. S. Smith

Physics and Astronomy (Twin Cities)

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Abstract

We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93 ± 0.13_stat ± 0.78_sys) × 10 ^-11 cm^-2 s^-1 above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ∼0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.

Original language	English (US)
Article number	69
Journal	Astrophysical Journal
Volume	776
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/776/2/69
State	Published - Oct 20 2013

Keywords

gamma rays: galaxies

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Archambault, S., Arlen, T., Aune, T., Behera, B., Beilicke, M., Benbow, W., Bird, R., Bouvier, A., Buckley, J. H., Bugaev, V., Byrum, K., Cesarini, A., Ciupik, L., Connolly, M. P., Cui, W., Errando, M., Falcone, A., Federici, S., Feng, Q., ... Smith, P. S. (2013). Discovery of a new TeV gamma-ray source: Ver J0521+211. Astrophysical Journal, 776(2), Article 69. https://doi.org/10.1088/0004-637X/776/2/69

Archambault, S, Arlen, T, Aune, T, Behera, B, Beilicke, M, Benbow, W, Bird, R, Bouvier, A, Buckley, JH, Bugaev, V, Byrum, K, Cesarini, A, Ciupik, L, Connolly, MP, Cui, W, Errando, M, Falcone, A, Federici, S, Feng, Q, Finley, JP, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, GH, Griffin, S, Grube, J, Gyuk, G, Hanna, D, Holder, J, Hughes, G, Humensky, TB, Kaaret, P, Kertzman, M, Khassen, Y, Kieda, D, Krawczynski, H, Krennrich, F, Kumar, S, Lang, MJ, Madhavan, AS, Maier, G, Majumdar, P, McArthur, S, McCann, A, Millis, J, Moriarty, P, Mukherjee, R, O'Faoláin De Bhróithe, A, Ong, RA, Otte, AN, Park, N, Perkins, JS, Pohl, M, Popkow, A, Prokoph, H, Quinn, J, Ragan, K, Reyes, LC, Reynolds, PT, Richards, GT, Roache, E, Saxon, DB, Sembroski, GH, Smith, AW, Staszak, D, Telezhinsky, I, Theiling, M, Varlotta, A, Vassiliev, VV, Vincent, S, Wakely, SP, Weekes, TC, Weinstein, A, Welsing, R, Williams, DA, Zitzer, B, Böttcher, M, Fegan, SJ, Fortin, P, Halpern, JP, Kovalev, YY, Lister, ML, Liu, J, Pushkarev, AB & Smith, PS 2013, 'Discovery of a new TeV gamma-ray source: Ver J0521+211', Astrophysical Journal, vol. 776, no. 2, 69. https://doi.org/10.1088/0004-637X/776/2/69

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title = "Discovery of a new TeV gamma-ray source: Ver J0521+211",

abstract = "We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93 ± 0.13stat ± 0.78sys) × 10 -11 cm-2 s-1 above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ∼0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.",

keywords = "gamma rays: galaxies",

author = "S. Archambault and T. Arlen and T. Aune and B. Behera and M. Beilicke and W. Benbow and R. Bird and A. Bouvier and Buckley, {J. H.} and V. Bugaev and K. Byrum and A. Cesarini and L. Ciupik and Connolly, {M. P.} and W. Cui and M. Errando and A. Falcone and S. Federici and Q. Feng and Finley, {J. P.} and L. Fortson and A. Furniss and N. Galante and D. Gall and Gillanders, {G. H.} and S. Griffin and J. Grube and G. Gyuk and D. Hanna and J. Holder and G. Hughes and Humensky, {T. B.} and P. Kaaret and M. Kertzman and Y. Khassen and D. Kieda and H. Krawczynski and F. Krennrich and S. Kumar and Lang, {M. J.} and Madhavan, {A. S.} and G. Maier and P. Majumdar and S. McArthur and A. McCann and J. Millis and P. Moriarty and R. Mukherjee and {O'Faol{\'a}in De Bhr{\'o}ithe}, A. and Ong, {R. A.} and Otte, {A. N.} and N. Park and Perkins, {J. S.} and M. Pohl and A. Popkow and H. Prokoph and J. Quinn and K. Ragan and Reyes, {L. C.} and Reynolds, {P. T.} and Richards, {G. T.} and E. Roache and Saxon, {D. B.} and Sembroski, {G. H.} and Smith, {A. W.} and D. Staszak and I. Telezhinsky and M. Theiling and A. Varlotta and Vassiliev, {V. V.} and S. Vincent and Wakely, {S. P.} and Weekes, {T. C.} and A. Weinstein and R. Welsing and Williams, {D. A.} and B. Zitzer and M. B{\"o}ttcher and Fegan, {S. J.} and P. Fortin and Halpern, {J. P.} and Kovalev, {Y. Y.} and Lister, {M. L.} and J. Liu and Pushkarev, {A. B.} and Smith, {P. S.}",

year = "2013",

month = oct,

day = "20",

doi = "10.1088/0004-637X/776/2/69",

language = "English (US)",

volume = "776",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

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TY - JOUR

T1 - Discovery of a new TeV gamma-ray source

T2 - Ver J0521+211

AU - Archambault, S.

AU - Arlen, T.

AU - Aune, T.

AU - Behera, B.

AU - Beilicke, M.

AU - Benbow, W.

AU - Bird, R.

AU - Bouvier, A.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Byrum, K.

AU - Cesarini, A.

AU - Ciupik, L.

AU - Connolly, M. P.

AU - Cui, W.

AU - Errando, M.

AU - Falcone, A.

AU - Federici, S.

AU - Feng, Q.

AU - Finley, J. P.

AU - Fortson, L.

AU - Furniss, A.

AU - Galante, N.

AU - Gall, D.

AU - Gillanders, G. H.

AU - Griffin, S.

AU - Grube, J.

AU - Gyuk, G.

AU - Hanna, D.

AU - Holder, J.

AU - Hughes, G.

AU - Humensky, T. B.

AU - Kaaret, P.

AU - Kertzman, M.

AU - Khassen, Y.

AU - Kieda, D.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Kumar, S.

AU - Lang, M. J.

AU - Madhavan, A. S.

AU - Maier, G.

AU - Majumdar, P.

AU - McArthur, S.

AU - McCann, A.

AU - Millis, J.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - O'Faoláin De Bhróithe, A.

AU - Ong, R. A.

AU - Otte, A. N.

AU - Park, N.

AU - Perkins, J. S.

AU - Pohl, M.

AU - Popkow, A.

AU - Prokoph, H.

AU - Quinn, J.

AU - Ragan, K.

AU - Reyes, L. C.

AU - Reynolds, P. T.

AU - Richards, G. T.

AU - Roache, E.

AU - Saxon, D. B.

AU - Sembroski, G. H.

AU - Smith, A. W.

AU - Staszak, D.

AU - Telezhinsky, I.

AU - Theiling, M.

AU - Varlotta, A.

AU - Vassiliev, V. V.

AU - Vincent, S.

AU - Wakely, S. P.

AU - Weekes, T. C.

AU - Weinstein, A.

AU - Welsing, R.

AU - Williams, D. A.

AU - Zitzer, B.

AU - Böttcher, M.

AU - Fegan, S. J.

AU - Fortin, P.

AU - Halpern, J. P.

AU - Kovalev, Y. Y.

AU - Lister, M. L.

AU - Liu, J.

AU - Pushkarev, A. B.

AU - Smith, P. S.

PY - 2013/10/20

Y1 - 2013/10/20

N2 - We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93 ± 0.13stat ± 0.78sys) × 10 -11 cm-2 s-1 above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ∼0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.

AB - We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93 ± 0.13stat ± 0.78sys) × 10 -11 cm-2 s-1 above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ∼0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.

KW - gamma rays: galaxies

UR - http://www.scopus.com/inward/record.url?scp=84886083660&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84886083660&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/776/2/69

DO - 10.1088/0004-637X/776/2/69

M3 - Article

AN - SCOPUS:84886083660

SN - 0004-637X

VL - 776

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 69

ER -

Discovery of a new TeV gamma-ray source: Ver J0521+211

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